1)Applies to the villa or single room

2)Supports door bell, intercom, video, monitoring and the door releasing

3)Outdoor camera with infrared auxiliary

4)Supports 4 indoor phone parallel connection and inter-call

5)Indoor phone support several chord bell ??able

6)Mate with remote controller

7)Connection layout: 4wires

8)connect with 1TO1,1TO2,1TO4,2TO1.2TO4